Titantaramellite Locality: Big Creek, Rush Creek deposit, Big Creek-Rush Creek District, Fresno Co., California, USA Field of view 6 mm. Specimen and photo Leon Hupperichs. — Photo: Leon Hupperichs · CC BY-SA 3.0
Titantaramellite
Titantaramellite is an IMA-recognized mineral species in the silicate class, with the chemical formula Ba₄(Ti,Fe³⁺,Mg)₄(O,OH)₂[B₂Si₈O₂₇]Clₓ.
It crystallizes in the orthorhombic crystal system (space group Pmmn).
Key properties: Mohs hardness 6; specific gravity 4.05; optically biaxial.
IMA symbol Ttmel, IMA status: approved, named in 1977.
Found in the contact zones around granite, quartz monzonite, and quartz diorite intrusives.
It is found associated with Sanbornite, quartz, macdonaldite, walstromite, fresnoite, verplanckite, muirite, traskite, benitoite, pabstite, bazirite (Rush Creek and Big Creek areas.
The name refers to its TITANium content and relation to taramellite.